High-efficiency energy-saving, bridging channel fully coupled fiber proppant system and its application method

A proppant, fully coupled technology, used in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve the failure to meet the needs of hydraulic fracturing in multiple wells, the high price of coated proppants, formation cracks and pores Damage and other problems, to achieve the effect of efficient suspension, low price, and little environmental damage

Active Publication Date: 2021-08-03
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also deficiencies in the above aspects: 1) Since unconventional reservoirs in my country are enriched in areas such as high mountains and hills, water resources are relatively scarce. Although improving the performance of fluids can improve the effective placement of proppant, limited water resources are also limited. It failed to meet the hydraulic fracturing needs of many wells; secondly, the high-viscosity fracturing fluid damages the formation is also particularly prominent, especially for the plugging of small pores and fracture widths such as shale gas and tight gas
However, the price of the film-coated proppant is too high, and the polymer covered by the film will also cause certain damage to the fractures and pores of the formation. Although the air-adsorbed proppant has a good suspension effect in the ground test evaluation, it is not effective in the reservoir due to Due to the limitation of temperature and high pressure, most of the gas in the reservoir exists in the critical phase state, which leads to less application of film-coated proppant in the field

Method used

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  • High-efficiency energy-saving, bridging channel fully coupled fiber proppant system and its application method
  • High-efficiency energy-saving, bridging channel fully coupled fiber proppant system and its application method
  • High-efficiency energy-saving, bridging channel fully coupled fiber proppant system and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] like figure 1 and 2 as shown, figure 1 is a schematic diagram of the structure of a conventional proppant. figure 2 It is a structural schematic diagram of the film-covered proppant of the present invention. It can be seen that the film-coated proppant of the present invention has a core-shell structure, the core of which is a conventional proppant, and the surface of the conventional proppant is sequentially wrapped with a connecting layer and a shell layer. The connecting layer is located between the core and the shell, and is used for fixedly connecting the core and the shell.

Embodiment 2

[0040] A kind of preparation of membrane proppant:

[0041] The film-covered proppant uses quartz sand as the core, 3-aminopropyltriethoxysilane and 3-chloro-1,2-propylene oxide as the connecting layer, and cocoamidosulfobetaine as the shell layer. All raw material formulations are as shown in Table 1:

[0042] Table 1 Raw materials used in film-coated proppants

[0043]

[0044] Preparation method steps:

[0045] (1) Select 20 / 40 mesh quartz sand and add it to the reaction vessel, soak it with 1wt% HCl solution for 30 minutes to remove the stains on the surface of the quartz sand; filter the liquid, wash with water to remove residual acid until neutral; After drying for 2 hours, set aside.

[0046] (2) Take 3-aminopropyltriethoxysilane and add it to the reaction vessel, add ethanol as a solvent, and stir at room temperature for 10mim; Mix well; raise the temperature of the reactor to 80°C, and react for 3h until the solvent is completely evaporated; continue to raise t...

Embodiment 3

[0050] A preparation method of film-coated proppant:

[0051] The film-covered proppant selects 40 / 70 mesh ceramsite as the core, N-(β-aminoethyl)-γ-aminopropyltriethoxysilane and glutaraldehyde as the connecting layer, and 10,000 molecular weight oil-soluble polymer as the shell Floor. All raw material formulations are as shown in Table 2:

[0052] Table 2 Raw materials used in film-coated proppants

[0053]

[0054] Preparation method steps:

[0055] (1) Select ceramsite of 40 / 70 mesh and add it to the reaction container, soak it with 1wt% HCl solution for 30 minutes to remove the stain on the surface of the quartz sand; filter the liquid, wash it with water to remove the residual acid until neutral; After drying for 2 hours, set aside.

[0056] (2) Take N-(β-aminoethyl)-γ-aminopropyltriethoxysilane into the reaction vessel, add ethanol as a solvent, and stir at room temperature for 10mim; then add step (1) to the reaction vessel to wash Clean and dry quartz sand, st...

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Abstract

The invention discloses a high-efficiency, energy-saving, and fully coupled fiber proppant system for bridging channels for fracturing. The system includes fracturing fluid, special fibers and membrane-coated proppants; Membrane proppant is based on conventional proppant as the core, on the surface of conventional proppant is wrapped successively with connecting layer and shell layer; connecting layer is nitrogen-containing silane coupling agent and crosslinking agent; shell layer material is small molecule surfactant Or an oil-soluble low-molecular-weight polymer; the oil-soluble low-molecular-weight polymer is a compound of one or at least two kinds of anionic polyacrylamide and its derivatives. The sand-carrying system of the present invention realizes high-efficiency suspension of the proppant, multiple recycling of reverse drainage fluid, and a high-speed oil-gas channel formed by a unique self-bridging method through the mutual coupling of the film-coated proppant and the special fiber.

Description

technical field [0001] The invention relates to the technical field of oil and gas stimulation and reformation, in particular to a sand-carrying system and an application method for improving the effective laying of proppant used in the field of fracturing. Background technique [0002] With the continuous exploitation and excavation of conventional oil and gas resources, the production stimulation of unconventional oil and gas reservoirs (shale oil and gas, tight oil and gas, coalbed methane, etc.) is particularly critical and urgent. However, due to the low permeability of unconventional oil and gas reservoirs, traditional mining methods cannot effectively develop such reservoirs. Therefore, hydraulic fracturing technology is particularly important for the effective development of such reservoirs. Hydraulic fracturing technology is mainly divided into the following steps: 1) Inject high-pressure fluid to rupture the reservoir and generate fracture channels; 2) Inject sand...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/80C09K8/68C09K8/88C09K8/90E21B43/267
CPCC09K8/685C09K8/805C09K8/882C09K8/887C09K8/90C09K2208/08E21B43/267
Inventor 李骏吴明移周利华何思源刘平礼李年银张渝苹韩旭吕三祥
Owner SOUTHWEST PETROLEUM UNIV
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